In a state Donald Trump won in 2016, Baldwin faces a tough re-election battle and is determined to turn out the vote in Milwaukee. U.S. Rep. Gwen Moore, D-Milwaukee, also appeared at the rally.

Delafield businessman Kevin Nicholson and state Sen. Leah Vukmir of Brookfield are competing for the Republican Party nomination.

Harris said Baldwin is a “fighter” but in a Wisconsin way, “truly modest” while “always standing for working families, always standing for what is practical, what is right.”

Harris and Baldwin both hit on the theme that outside money has poured into Wisconsin to oust the first-term Democrat. Nicholson has benefited from $6 million in outside spending, with $1.5 million supporting Vukmir and $1 million in favor of Baldwin.

In addition, $3 million in outside spending has gone against Baldwin.

“Now, you all know this, they’ve been running ads since January of last year,” Harris said. “We’ve got a lot of folks up for re-election. I don’t think any of them were looking at campaign commercials against them since January of last year.

“These folks are spending tens of millions of dollars trying to take her out. You have to ask why would they be putting so much in trying to take her out. And the answer is pretty obvious, because she is a force of power.”